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Aluminum alloys are used primarily to produce rings, structural components, automotive systems, and aerospace components. Fusion welds are difficult to perform on these alloys due to their poor joint efficiency, solidification cracking, and alloy segregation in aluminum joints. Thus, solid-state welding techniques are preferred for their higher performance with fewer defects, as well as their eco-friendliness. In the present study, solid-state friction stir welding (FSW) process is used for joining dissimilar aluminum alloys AA5083/AA6061. Weld specimens were fabricated for dimensions of 150 x 150 x 6 mm. The rotational speed, the transverse speed, and the tilt angle were set to 1000 rpm, 25 mm/min, and 2°, respectively. The welded specimens were evaluated for their microstructural and mechanical properties. The mode of failure was observed by scanning electron microscope (SEM). As a result, the dissimilar joints showed a maximum tensile strength of 194.3 MPa and a maximum hardness of 86 Hv in the nugget zone. The maximum hardness was caused by recrystallizing grains in the nugget zone, and the rupture occurred at the heat-affected zone (HAZ) on the retreating side. [ABSTRACT FROM AUTHOR]

Aluminium alloys play a major role in synthesizing parts for the aerospace, automobile, and defence sectors because of their ease of production and modification. The addition of hard-ceramic particles to the aluminium matrix will improve the strength-to-weight ratio. Aluminium 7075 alloy is chosen as a workpiece because of its high strength and low weight. Metal matrix composites, particularly aluminium alloy matrix composites, are suitable choices for industrial applications because of their favourable technical features. In this work, the Aluminium 7075 metal matrix was strengthened with Graphite and Bagasse ash. It was formulated by the stir casting method. The reinforcement was added in three compositions. The machining characteristics are studied by testing its properties such as the microstructure of the specimen and properties of wear. The properties of these specimens are compared with the three compositions that we have produced and the best is chosen among them. The microstructure is analysed using Scanning Electron Microscope (SEM). [ABSTRACT FROM AUTHOR]

Owing to its unique weldability and flexibility to be extruded, polymer composites are frequently utilised in welding, extrusions, forging, and casting. By integrating hard-ceramic particles into the aluminium matrix, the strength- to-weight ratio will be enhanced. Because of its high strength and low weight, aluminium 6061 alloy is used as workpiece material. Because of their favourable technical features, metal matrix composites, particularly aluminium alloy matrix composites, are good choices for industrial applications. The metal matrix of Aluminum 6061 was strengthened with Ash and SiC in this project. The stir casting procedure helped to create it. Three different mixes of reinforcement were used. Testing such as the tensile test, hardness test, impact test and microstructure examination are used to investigate mechanical qualities. These specimens' qualities are compared to the three compositions we've created, and the best of them is picked. Scanning Electron Microscope is used to examine the microstructure (SEM). [ABSTRACT FROM AUTHOR]

Composites of aluminium alloy have strength comparable to conventional metals. Copperas an alloying element results in improved strength of aluminium. Silicon carbide and graphite also yield better strength when reinforced to aluminium alloys. Graphite has additional advantage due to its solid lubricant characteristic. Effect of silicon carbide and graphite on tensile strength and hardness are studied by varying reinforcement of silicon carbide the percentage of which is based on design of experiments. Tensile strength along with hardnesshas increased with 0 – 8 % SiC reinforcement. These values are further improved upon additionof graphite as secondary reinforcement in the hybrid composites. This can be attributed to uniform distribution of reinforcements as reveled by Scanning Electron Microscope images. [ABSTRACT FROM AUTHOR]